[R-sig-Geo] How to deal with data points having the same lat long position?

José Luis Rotundo rotundo.jose at gmail.com
Sat Sep 6 00:28:21 CEST 2014


Thank you very much for your suggestion. It might work.



2014-09-05 16:29 GMT-03:00 Christopher Swingley <cswingle at swingleydev.com>:

> Jose,
> On Fri, Sep 5, 2014 at 10:29 AM, José Luis Rotundo <jrotundo at unr.edu.ar>
> wrote:
> > I am working with a database of farm yields across USA and the objective
> is
> > to map soybean yields. To preserve the identity of the farmers, they only
> > provided the zipcode of the farm. Then I attached the zip code lat and
> > long. The problem I have is that several farms belongs to the same
> zipcode
> > and therefore they have the same lat and long. Having this repeated
> > locations troubles the construction of the variogram.
> Wouldn't it be better to attach the sum of the soybean yields assigned
> to a zip code to a vector layer containing zip code boundaries?  I can
> imagine that if you assign values to a single point (even jittered
> when there are duplicates for single zip code) per zip code, that you
> won't wind up with a very accurate representation of the spatial
> pattern because the area each zip code covers will be different.
> Cheers,
> Chris
> --
> Christopher Swingley
> Fairbanks, Alaska
> http://swingleydev.com/
> cswingle at swingleydev.com
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José L. Rotundo
Facultad de Ciencias Agrarias
Univ. Nacional de Rosario
Zavalla, Santa Fe

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